s2.dev

API for unlimited, durable, real-time streams

Y CombinatorFall 2025ActiveB2BInfrastructureDeveloper ToolsAPIInfrastructureDatabases

What they do

Problem

Developers lack a simple, reliable way to store, access, and share durable real-time streams over the internet at scale.

Solution

S2 provides an API that turns durable streaming data into unlimited, access-controlled web resources for real-time publishing and replay.

Who it's for

Developers and engineering teams building streaming applications, agents, and real-time data feeds.

Founders

Shikhar Bhushan

Co-founder and CEO

Making streams plentiful and serverless. Hacked on retrieval systems at Etsy, a KV store at Facebook, and Kafka Connect at Confluent.

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Stephen Balogh

Co-founder and CTO

Loves Rust, and building systems that scale. Previously built novel infra for multi-modal product search at Etsy, and digital repository software at NYU

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Dwarak Govind Parthiban

Co-founder

Passionate about systems and AI. Worked on applied AI at Etsy, ML platform at Freshworks. Researched on language models at uOttawa and published at AAAI-21.

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